Anthraquinone vat dyes and process of making them.



TINTTTED STATES.

max ISLER, or MANNHEIM, GERMANY,

ASSIGNCR 'IO BADISQHE ANILIN &, SODA.

rABnIK, or Lunwrcsrrarnmoiwrnnnnmn,- GERMAnY A comonA-rron.

ANTHRAQUINO'NE VAT AND PROCESS OF MAKING THEM.

.No Drawing.

To all whom it may concern Beit known that 1 MAX Isnnn, citizen of theSwiss Republic, residing at Mannheim, Germany, have'invented new anduseful Imrovements in Anthraquinone Vat Dyes and rocesses of MakingThem, of which the following is,a specification. t

My invention consists in the manufacture and productionof new vat-dyesof the anthraquinone series by reacting on 1*halogen-anthraquinone or aI derivative thereof, as hereinafter defined,with an anthraquinonecompound which contains two mercapto' groups in the positions'l and 2. 1My new dyes are regarded as containing two anthraquinone residues joinedtogether by two sulfur atoms and the simplest mem= her of them probably.possesses a constitution corresponding to the formula anthraqulnoneenters the said position-2;

My new compounds are characterized by' being obtainable 1n the form ofred crystals; they yield green to blue solutions in concentratedsulfuric acid and dye cotton, from a vat, red shades of excellentfastness.

The following example will serve to illustrate further the nature of myinvention and how it can be carried into practical effect, but

' the invention is not confined to this example.

The parts are by weight. Boil together, for from 2 to 3 hours, 30 partsof anthraquinone-LQ-dimercaptan (in the form of-its di-sodium or dipotassium salt), 20 parts of v1.2-dichlor-anthraquinone and from 200 to400 parts of nitrobenzene or of naphthalene. When the melt is cold,filter off the product and wash it with alcohol in order to free it fromany nitrobenzene or naphthalene. The new product can be re-crystallizedfrom ni- Specification of Letters Patent. Application filed March 30,1912. Serial No. 687,511. I

the corresponding 1.2-dihalo- Patented. July 9, 1912.

trobenzene, the resulting glittering red crystals yielding-a greenbluesolution in concentrated sulfuric acid. The said crystals are insolublein caustic soda solution, but are soluble in alkaline hydrosulfite,forming a vat which dyes cotton brick-red shades. In a slmilar manner,derivatives of either of the initial products can be employed forconversion into coloring matter.

Now what I claim is 1. The process ,of producing vat dyes of theanthraquinoneseries by reacting. on a l-halogen-anthraquinone body witharranthraquinone compound which containstwo mercapto groups in theositions 1 and 2.; 2.,The process of pro ucing a vat dye of;

thraquinone-1.2-dimercaptan with 1.2-dichlor-anthraquinone.

3. The new vat dyes of the anthraquinone series which can be obtained byreacting on a I-halogen-anthraquinOne body with an anthraquinonecompound which contains two mercapto groups in the positions 1 and 2,which new vat dyes probably contain two in the form of red crystals,which yield green to blue solutions in concentrated sulfuric acidand dyecotton from the vat red shades of excellent fastness.

4. The new v'at dye of the anthraquinone series which can be obtained byreacting on anthraquinone-l.2-dimercaptan with 1.2-dichlor-anthraquinoneand probably possesses a constitution corresponding to the formula wtnesses.

MAX ISLER.

Witnesses:

J. Anne. LLOYD, J os. Prnrrrnn.

. 7 Copies of this patent may be obtained for five cents each, by'addressing the Commissioner of Patents,

Washington, D. G.

the anthraquinone series by reacting on an;

anthraquinone residues joined together by two'sulfur atoms and which canbe obtained

